linux-kernel - Re: [PATCH v3 0/4] Raspberry Pi 4 HWRNG Support

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Date:   Wed, 20 Nov 2019 20:50:14 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Stefan Wahren <wahrenst@....net>,
        Stephen Brennan <stephen@...nnan.io>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Scott Branden <sbranden@...adcom.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, linux-crypto@...r.kernel.org,
        Eric Anholt <eric@...olt.net>,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org, Ray Jui <rjui@...adcom.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/4] Raspberry Pi 4 HWRNG Support

On Wed, 2019-11-20 at 17:16 +0100, Stefan Wahren wrote:
> Hi Stephen,
> 
> Am 20.11.19 um 04:16 schrieb Stephen Brennan:
> > This patch series enables support for the HWRNG included on the Raspberry
> > Pi 4.  It is simply a rebase of Stefan's branch [1]. I went ahead and
> > tested this out on a Pi 4.  Prior to this patch series, attempting to use
> > the hwrng gives:
> > 
> >     $ head -c 2 /dev/hwrng
> >     head: /dev/hwrng: Input/output error
> > 
> > After this series, the same command gives two random bytes.
> 
> just a note: a more expressive test would be running rngtest (package
> rng-tools) on this device.

Just had a go at it,

root@...4:~# rngtest -c 1000 < /dev/hwrng
rngtest 2-unofficial-mt.14
Copyright (c) 2004 by Henrique de Moraes Holschuh
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

rngtest: starting FIPS tests...
rngtest: bits received from input: 20000032
rngtest: FIPS 140-2 successes: 998
rngtest: FIPS 140-2 failures: 2
rngtest: FIPS 140-2(2001-10-10) Monobit: 0
rngtest: FIPS 140-2(2001-10-10) Poker: 1
rngtest: FIPS 140-2(2001-10-10) Runs: 0
rngtest: FIPS 140-2(2001-10-10) Long run: 1
rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
rngtest: input channel speed: (min=1.284; avg=113.786; max=126.213)Kibits/s
rngtest: FIPS tests speed: (min=17.122; avg=28.268; max=28.812)Mibits/s
rngtest: Program run time: 172323761 microseconds

AFAIR (Arch wiki) some small failures are acceptable.

Regards,
Nicolas


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